METHODS AND APPARATUS FOR COLOR CALIBRATION AND VERIFICATION

摘要

Methods and apparatus for calibrating a color measuring instrument with a color standard and verifying the color standard and calibration are provided. One method includes providing a color standard having a surface with at least two different colors (preferably arranged for a simultaneous color measurement), calibrating the instrument, and verifying that said color standard is an authorized color standard of a predetermined specification and that the calibration of the color measuring instrument has achieved predetermined specified results. Some of the provided methods and apparatus use a photosensitive portion of the color standard that changes color in a known way when exposed to a predetermined dose of light. Various color standards for use with this invention are provided.